/* *
 *
 *  (c) 2010-2019 Torstein Honsi
 *
 *  License: www.highcharts.com/license
 *
 *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
 *
 * */
"use strict";
import H from "../parts/Globals.js";
/**
 * Color axis types
 *
 * @typedef {"linear"|"logarithmic"} Highcharts.ColorAxisTypeValue
 */
import U from "../parts/Utilities.js";
var erase = U.erase,
  extend = U.extend,
  isNumber = U.isNumber,
  pick = U.pick,
  splat = U.splat;
import "../parts/Axis.js";
import "../parts/Chart.js";
import "../parts/Color.js";
import "../parts/Legend.js";
import "./ColorSeriesMixin.js";
var addEvent = H.addEvent,
  Axis = H.Axis,
  Chart = H.Chart,
  Series = H.Series,
  Point = H.Point,
  color = H.color,
  ColorAxis,
  Legend = H.Legend,
  LegendSymbolMixin = H.LegendSymbolMixin,
  colorPointMixin = H.colorPointMixin,
  colorSeriesMixin = H.colorSeriesMixin,
  noop = H.noop,
  merge = H.merge;
extend(Series.prototype, colorSeriesMixin);
extend(Point.prototype, colorPointMixin);
Chart.prototype.collectionsWithUpdate.push("colorAxis");
Chart.prototype.collectionsWithInit.colorAxis = [Chart.prototype.addColorAxis];
/* eslint-disable no-invalid-this, valid-jsdoc */
/**
 * The ColorAxis object for inclusion in gradient legends.
 *
 * @class
 * @name Highcharts.ColorAxis
 * @augments Highcharts.Axis
 *
 * @param {Highcharts.Chart} chart
 * The related chart of the color axis.
 *
 * @param {Highcharts.ColorAxisOptions} userOptions
 * The color axis options for initialization.
 */
ColorAxis = H.ColorAxis = function () {
  this.init.apply(this, arguments);
};
/* eslint-enable no-invalid-this, valid-jsdoc */
extend(ColorAxis.prototype, Axis.prototype);
extend(ColorAxis.prototype, {
  /**
   * A color axis for series. Visually, the color
   * axis will appear as a gradient or as separate items inside the
   * legend, depending on whether the axis is scalar or based on data
   * classes.
   *
   * For supported color formats, see the
   * [docs article about colors](https://www.highcharts.com/docs/chart-design-and-style/colors).
   *
   * A scalar color axis is represented by a gradient. The colors either
   * range between the [minColor](#colorAxis.minColor) and the
   * [maxColor](#colorAxis.maxColor), or for more fine grained control the
   * colors can be defined in [stops](#colorAxis.stops). Often times, the
   * color axis needs to be adjusted to get the right color spread for the
   * data. In addition to stops, consider using a logarithmic
   * [axis type](#colorAxis.type), or setting [min](#colorAxis.min) and
   * [max](#colorAxis.max) to avoid the colors being determined by
   * outliers.
   *
   * When [dataClasses](#colorAxis.dataClasses) are used, the ranges are
   * subdivided into separate classes like categories based on their
   * values. This can be used for ranges between two values, but also for
   * a true category. However, when your data is categorized, it may be as
   * convenient to add each category to a separate series.
   *
   * Color axis does not work with: `sankey`, `sunburst`, `dependencywheel`,
   * `networkgraph`, `wordcloud`, `venn`, `gauge` and `solidgauge` series
   * types.
   *
   * Since v7.2.0 `colorAxis` can also be an array of options objects.
   *
   * See [the Axis object](/class-reference/Highcharts.Axis) for
   * programmatic access to the axis.
   *
   * @sample       {highcharts} highcharts/coloraxis/custom-color-key
   *               Column chart with color axis
   * @sample       {highcharts} highcharts/coloraxis/horizontal-layout
   *               Horizontal layout
   * @sample       {highmaps} maps/coloraxis/dataclasscolor
   *               With data classes
   * @sample       {highmaps} maps/coloraxis/mincolor-maxcolor
   *               Min color and max color
   *
   * @extends      xAxis
   * @excluding    alignTicks, allowDecimals, alternateGridColor, breaks,
   *               categories, crosshair, dateTimeLabelFormats, height, left,
   *               lineWidth, linkedTo, maxZoom, minRange, minTickInterval,
   *               offset, opposite, pane, plotBands, plotLines,
   *               reversedStacks, showEmpty, title, top, width, zoomEnabled
   * @product      highcharts highstock highmaps
   * @type         {*|Array<*>}
   * @optionparent colorAxis
   * @ignore
   */
  defaultColorAxisOptions: {
    /**
     * Whether to allow decimals on the color axis.
     * @type      {boolean}
     * @default   true
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.allowDecimals
     */
    /**
     * Determines how to set each data class' color if no individual
     * color is set. The default value, `tween`, computes intermediate
     * colors between `minColor` and `maxColor`. The other possible
     * value, `category`, pulls colors from the global or chart specific
     * [colors](#colors) array.
     *
     * @sample {highmaps} maps/coloraxis/dataclasscolor/
     *         Category colors
     *
     * @type       {string}
     * @default    tween
     * @product    highcharts highstock highmaps
     * @validvalue ["tween", "category"]
     * @apioption  colorAxis.dataClassColor
     */
    /**
     * An array of data classes or ranges for the choropleth map. If
     * none given, the color axis is scalar and values are distributed
     * as a gradient between the minimum and maximum colors.
     *
     * @sample {highmaps} maps/demo/data-class-ranges/
     *         Multiple ranges
     *
     * @sample {highmaps} maps/demo/data-class-two-ranges/
     *         Two ranges
     *
     * @type      {Array<*>}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.dataClasses
     */
    /**
     * The layout of the color axis. Can be `'horizontal'` or `'vertical'`.
     * If none given, the color axis has the same layout as the legend.
     *
     * @sample highcharts/coloraxis/horizontal-layout/
     *         Horizontal color axis layout with vertical legend
     *
     * @type      {string|undefined}
     * @since     7.2.0
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.layout
     */
    /**
     * The color of each data class. If not set, the color is pulled
     * from the global or chart-specific [colors](#colors) array. In
     * styled mode, this option is ignored. Instead, use colors defined
     * in CSS.
     *
     * @sample {highmaps} maps/demo/data-class-two-ranges/
     *         Explicit colors
     *
     * @type      {Highcharts.ColorString|Highcharts.GradientColorObject|Highcharts.PatternObject}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.dataClasses.color
     */
    /**
     * The start of the value range that the data class represents,
     * relating to the point value.
     *
     * The range of each `dataClass` is closed in both ends, but can be
     * overridden by the next `dataClass`.
     *
     * @type      {number}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.dataClasses.from
     */
    /**
     * The name of the data class as it appears in the legend.
     * If no name is given, it is automatically created based on the
     * `from` and `to` values. For full programmatic control,
     * [legend.labelFormatter](#legend.labelFormatter) can be used.
     * In the formatter, `this.from` and `this.to` can be accessed.
     *
     * @sample {highmaps} maps/coloraxis/dataclasses-name/
     *         Named data classes
     *
     * @sample {highmaps} maps/coloraxis/dataclasses-labelformatter/
     *         Formatted data classes
     *
     * @type      {string}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.dataClasses.name
     */
    /**
     * The end of the value range that the data class represents,
     * relating to the point value.
     *
     * The range of each `dataClass` is closed in both ends, but can be
     * overridden by the next `dataClass`.
     *
     * @type      {number}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.dataClasses.to
     */
    /** @ignore-option */
    lineWidth: 0,
    /**
     * Padding of the min value relative to the length of the axis. A
     * padding of 0.05 will make a 100px axis 5px longer.
     *
     * @product highcharts highstock highmaps
     */
    minPadding: 0,
    /**
     * The maximum value of the axis in terms of map point values. If
     * `null`, the max value is automatically calculated. If the
     * `endOnTick` option is true, the max value might be rounded up.
     *
     * @sample {highmaps} maps/coloraxis/gridlines/
     *         Explicit min and max to reduce the effect of outliers
     *
     * @type      {number}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.max
     */
    /**
     * The minimum value of the axis in terms of map point values. If
     * `null`, the min value is automatically calculated. If the
     * `startOnTick` option is true, the min value might be rounded
     * down.
     *
     * @sample {highmaps} maps/coloraxis/gridlines/
     *         Explicit min and max to reduce the effect of outliers
     *
     * @type      {number}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.min
     */
    /**
     * Padding of the max value relative to the length of the axis. A
     * padding of 0.05 will make a 100px axis 5px longer.
     *
     * @product highcharts highstock highmaps
     */
    maxPadding: 0,
    /**
     * Color of the grid lines extending from the axis across the
     * gradient.
     *
     * @sample {highmaps} maps/coloraxis/gridlines/
     *         Grid lines demonstrated
     *
     * @type      {Highcharts.ColorString|Highcharts.GradientColorObject|Highcharts.PatternObject}
     * @default   #e6e6e6
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.gridLineColor
     */
    /**
     * The width of the grid lines extending from the axis across the
     * gradient of a scalar color axis.
     *
     * @sample {highmaps} maps/coloraxis/gridlines/
     *         Grid lines demonstrated
     *
     * @product highcharts highstock highmaps
     */
    gridLineWidth: 1,
    /**
     * The interval of the tick marks in axis units. When `null`, the
     * tick interval is computed to approximately follow the
     * `tickPixelInterval`.
     *
     * @type      {number}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.tickInterval
     */
    /**
     * If [tickInterval](#colorAxis.tickInterval) is `null` this option
     * sets the approximate pixel interval of the tick marks.
     *
     * @product highcharts highstock highmaps
     */
    tickPixelInterval: 72,
    /**
     * Whether to force the axis to start on a tick. Use this option
     * with the `maxPadding` option to control the axis start.
     *
     * @product highcharts highstock highmaps
     */
    startOnTick: true,
    /**
     * Whether to force the axis to end on a tick. Use this option with
     * the [maxPadding](#colorAxis.maxPadding) option to control the
     * axis end.
     *
     * @product highcharts highstock highmaps
     */
    endOnTick: true,
    /** @ignore */
    offset: 0,
    /**
     * The triangular marker on a scalar color axis that points to the
     * value of the hovered area. To disable the marker, set
     * `marker: null`.
     *
     * @sample {highmaps} maps/coloraxis/marker/
     *         Black marker
     *
     * @declare Highcharts.PointMarkerOptionsObject
     * @product highcharts highstock highmaps
     */
    marker: {
      /**
       * Animation for the marker as it moves between values. Set to
       * `false` to disable animation. Defaults to `{ duration: 50 }`.
       *
       * @type    {boolean|Highcharts.AnimationOptionsObject}
       * @product highcharts highstock highmaps
       */
      animation: {
        /** @internal */
        duration: 50,
      },
      /** @internal */
      width: 0.01,
      /**
       * The color of the marker.
       *
       * @type    {Highcharts.ColorString|Highcharts.GradientColorObject|Highcharts.PatternObject}
       * @product highcharts highstock highmaps
       */
      color: "#999999",
    },
    /**
     * The axis labels show the number for each tick.
     *
     * For more live examples on label options, see [xAxis.labels in the
     * Highcharts API.](/highcharts#xAxis.labels)
     *
     * @extends xAxis.labels
     * @product highcharts highstock highmaps
     */
    labels: {
      /**
       * How to handle overflowing labels on horizontal color axis. If set
       * to `"allow"`, it will not be aligned at all. By default it
       * `"justify"` labels inside the chart area. If there is room to
       * move it, it will be aligned to the edge, else it will be removed.
       *
       * @validvalue ["allow", "justify"]
       * @product    highcharts highstock highmaps
       */
      overflow: "justify",
      rotation: 0,
    },
    /**
     * The color to represent the minimum of the color axis. Unless
     * [dataClasses](#colorAxis.dataClasses) or
     * [stops](#colorAxis.stops) are set, the gradient starts at this
     * value.
     *
     * If dataClasses are set, the color is based on minColor and
     * maxColor unless a color is set for each data class, or the
     * [dataClassColor](#colorAxis.dataClassColor) is set.
     *
     * @sample {highmaps} maps/coloraxis/mincolor-maxcolor/
     *         Min and max colors on scalar (gradient) axis
     * @sample {highmaps} maps/coloraxis/mincolor-maxcolor-dataclasses/
     *         On data classes
     *
     * @type    {Highcharts.ColorString|Highcharts.GradientColorObject|Highcharts.PatternObject}
     * @product highcharts highstock highmaps
     */
    minColor: "#e6ebf5",
    /**
     * The color to represent the maximum of the color axis. Unless
     * [dataClasses](#colorAxis.dataClasses) or
     * [stops](#colorAxis.stops) are set, the gradient ends at this
     * value.
     *
     * If dataClasses are set, the color is based on minColor and
     * maxColor unless a color is set for each data class, or the
     * [dataClassColor](#colorAxis.dataClassColor) is set.
     *
     * @sample {highmaps} maps/coloraxis/mincolor-maxcolor/
     *         Min and max colors on scalar (gradient) axis
     * @sample {highmaps} maps/coloraxis/mincolor-maxcolor-dataclasses/
     *         On data classes
     *
     * @type    {Highcharts.ColorString|Highcharts.GradientColorObject|Highcharts.PatternObject}
     * @product highcharts highstock highmaps
     */
    maxColor: "#003399",
    /**
     * Color stops for the gradient of a scalar color axis. Use this in
     * cases where a linear gradient between a `minColor` and `maxColor`
     * is not sufficient. The stops is an array of tuples, where the
     * first item is a float between 0 and 1 assigning the relative
     * position in the gradient, and the second item is the color.
     *
     * @sample {highmaps} maps/demo/heatmap/
     *         Heatmap with three color stops
     *
     * @type      {Array<Array<number,Highcharts.ColorString>>}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.stops
     */
    /**
     * The pixel length of the main tick marks on the color axis.
     */
    tickLength: 5,
    /**
     * The type of interpolation to use for the color axis. Can be
     * `linear` or `logarithmic`.
     *
     * @sample highcharts/coloraxis/logarithmic-with-emulate-negative-values/
     *         Logarithmic color axis with extension to emulate negative
     *         values
     *
     * @type      {Highcharts.ColorAxisTypeValue}
     * @default   linear
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.type
     */
    /**
     * Whether to reverse the axis so that the highest number is closest
     * to the origin. Defaults to `false` in a horizontal legend and
     * `true` in a vertical legend, where the smallest value starts on
     * top.
     *
     * @type      {boolean}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.reversed
     */
    /**
     * @product   highcharts highstock highmaps
     * @excluding afterBreaks, pointBreak, pointInBreak
     * @apioption colorAxis.events
     */
    /**
     * Fires when the legend item belonging to the colorAxis is clicked.
     * One parameter, `event`, is passed to the function.
     *
     * @type      {Function}
     * @product   highcharts highstock highmaps
     * @apioption colorAxis.events.legendItemClick
     */
    /**
     * Whether to display the colorAxis in the legend.
     *
     * @sample highcharts/coloraxis/hidden-coloraxis-with-3d-chart/
     *         Hidden color axis with 3d chart
     *
     * @see [heatmap.showInLegend](#series.heatmap.showInLegend)
     *
     * @since   4.2.7
     * @product highcharts highstock highmaps
     */
    showInLegend: true,
  },
  // Properties to preserve after destroy, for Axis.update (#5881, #6025)
  keepProps: [
    "legendGroup",
    "legendItemHeight",
    "legendItemWidth",
    "legendItem",
    "legendSymbol",
  ].concat(Axis.prototype.keepProps),
  /* eslint-disable no-invalid-this, valid-jsdoc */
  /**
   * Initializes the color axis.
   *
   * @function Highcharts.ColorAxis#init
   *
   * @param {Highcharts.Chart} chart
   * The related chart of the color axis.
   *
   * @param {Highcharts.ColorAxisOptions} userOptions
   * The color axis options for initialization.
   *
   * @return {void}
   */
  init: function (chart, userOptions) {
    var options;
    this.coll = "colorAxis";
    // Build the options
    options = this.buildOptions.call(
      chart,
      this.defaultColorAxisOptions,
      userOptions
    );
    Axis.prototype.init.call(this, chart, options);
    // Base init() pushes it to the xAxis array, now pop it again
    // chart[this.isXAxis ? 'xAxis' : 'yAxis'].pop();
    // Prepare data classes
    if (userOptions.dataClasses) {
      this.initDataClasses(userOptions);
    }
    this.initStops();
    // Override original axis properties
    this.horiz = !options.opposite;
    this.zoomEnabled = false;
    // Add default values
    this.defaultLegendLength = 200;
  },
  /**
   * @private
   */
  initDataClasses: function (userOptions) {
    var chart = this.chart,
      dataClasses,
      colorCounter = 0,
      colorCount = chart.options.chart.colorCount,
      options = this.options,
      len = userOptions.dataClasses.length;
    this.dataClasses = dataClasses = [];
    this.legendItems = [];
    userOptions.dataClasses.forEach(function (dataClass, i) {
      var colors;
      dataClass = merge(dataClass);
      dataClasses.push(dataClass);
      if (!chart.styledMode && dataClass.color) {
        return;
      }
      if (options.dataClassColor === "category") {
        if (!chart.styledMode) {
          colors = chart.options.colors;
          colorCount = colors.length;
          dataClass.color = colors[colorCounter];
        }
        dataClass.colorIndex = colorCounter;
        // increase and loop back to zero
        colorCounter++;
        if (colorCounter === colorCount) {
          colorCounter = 0;
        }
      } else {
        dataClass.color = color(options.minColor).tweenTo(
          color(options.maxColor),
          len < 2 ? 0.5 : i / (len - 1) // #3219
        );
      }
    });
  },
  /**
   * Returns true if the series has points at all.
   *
   * @function Highcharts.ColorAxis#hasData
   *
   * @return {boolean}
   * True, if the series has points, otherwise false.
   */
  hasData: function () {
    return !!(this.tickPositions && this.tickPositions.length);
  },
  /**
   * Override so that ticks are not added in data class axes (#6914)
   *
   * @private
   * @function Highcharts.ColorAxis#setTickPositions
   * @return {void}
   */
  setTickPositions: function () {
    if (!this.dataClasses) {
      return Axis.prototype.setTickPositions.call(this);
    }
  },
  /**
   * @private
   */
  initStops: function () {
    this.stops = this.options.stops || [
      [0, this.options.minColor],
      [1, this.options.maxColor],
    ];
    this.stops.forEach(function (stop) {
      stop.color = color(stop[1]);
    });
  },
  /**
   * Build options to keep layout params on init and update.
   *
   * @private
   * @param {Highcharts.ColorAxisOptions} options
   * @param {Highcharts.ColorAxisOptions} [userOptions]
   * @return {Highcharts.ColorAxisOptions}
   */
  buildOptions: function (options, userOptions) {
    var legend = this.options.legend,
      horiz = userOptions.layout
        ? userOptions.layout !== "vertical"
        : legend.layout !== "vertical";
    return merge(
      options,
      {
        side: horiz ? 2 : 1,
        reversed: !horiz,
      },
      userOptions,
      {
        opposite: !horiz,
        showEmpty: false,
        title: null,
        visible:
          legend.enabled &&
          (userOptions ? userOptions.visible !== false : true),
      }
    );
  },
  /**
   * Extend the setOptions method to process extreme colors and color
   * stops.
   *
   * @private
   * @function Highcharts.ColorAxis#setOptions
   * @param {Highcharts.ColorAxisOptions} userOptions
   * @return {void}
   */
  setOptions: function (userOptions) {
    Axis.prototype.setOptions.call(this, userOptions);
    this.options.crosshair = this.options.marker;
  },
  /**
   * @private
   */
  setAxisSize: function () {
    var symbol = this.legendSymbol,
      chart = this.chart,
      legendOptions = chart.options.legend || {},
      x,
      y,
      width,
      height;
    if (symbol) {
      this.left = x = symbol.attr("x");
      this.top = y = symbol.attr("y");
      this.width = width = symbol.attr("width");
      this.height = height = symbol.attr("height");
      this.right = chart.chartWidth - x - width;
      this.bottom = chart.chartHeight - y - height;
      this.len = this.horiz ? width : height;
      this.pos = this.horiz ? x : y;
    } else {
      // Fake length for disabled legend to avoid tick issues
      // and such (#5205)
      this.len =
        (this.horiz ? legendOptions.symbolWidth : legendOptions.symbolHeight) ||
        this.defaultLegendLength;
    }
  },
  /**
   * @private
   */
  normalizedValue: function (value) {
    if (this.isLog) {
      value = this.val2lin(value);
    }
    return 1 - (this.max - value) / (this.max - this.min || 1);
  },
  /**
   * Translate from a value to a color.
   *
   * @private
   * @function Highcharts.ColorAxis#toColor
   * @param {number} value
   * @param {Highcharts.Point} point
   * @return {Highcharts.ColorString|Highcharts.GradientColorObject|Highcharts.PatternObject|undefined}
   */
  toColor: function (value, point) {
    var pos,
      stops = this.stops,
      from,
      to,
      color,
      dataClasses = this.dataClasses,
      dataClass,
      i;
    if (dataClasses) {
      i = dataClasses.length;
      while (i--) {
        dataClass = dataClasses[i];
        from = dataClass.from;
        to = dataClass.to;
        if (
          (typeof from === "undefined" || value >= from) &&
          (typeof to === "undefined" || value <= to)
        ) {
          color = dataClass.color;
          if (point) {
            point.dataClass = i;
            point.colorIndex = dataClass.colorIndex;
          }
          break;
        }
      }
    } else {
      pos = this.normalizedValue(value);
      i = stops.length;
      while (i--) {
        if (pos > stops[i][0]) {
          break;
        }
      }
      from = stops[i] || stops[i + 1];
      to = stops[i + 1] || from;
      // The position within the gradient
      pos = 1 - (to[0] - pos) / (to[0] - from[0] || 1);
      color = from.color.tweenTo(to.color, pos);
    }
    return color;
  },
  /**
   * Override the getOffset method to add the whole axis groups inside
   * the legend.
   *
   * @private
   * @function Highcharts.ColorAxis#getOffset
   * @return {void}
   */
  getOffset: function () {
    var group = this.legendGroup,
      sideOffset = this.chart.axisOffset[this.side];
    if (group) {
      // Hook for the getOffset method to add groups to this parent
      // group
      this.axisParent = group;
      // Call the base
      Axis.prototype.getOffset.call(this);
      // First time only
      if (!this.added) {
        this.added = true;
        this.labelLeft = 0;
        this.labelRight = this.width;
      }
      // Reset it to avoid color axis reserving space
      this.chart.axisOffset[this.side] = sideOffset;
    }
  },
  /**
   * Create the color gradient.
   *
   * @private
   * @function Highcharts.ColorAxis#setLegendColor
   */
  setLegendColor: function () {
    var grad,
      horiz = this.horiz,
      reversed = this.reversed,
      one = reversed ? 1 : 0,
      zero = reversed ? 0 : 1;
    grad = horiz ? [one, 0, zero, 0] : [0, zero, 0, one]; // #3190
    this.legendColor = {
      linearGradient: {
        x1: grad[0],
        y1: grad[1],
        x2: grad[2],
        y2: grad[3],
      },
      stops: this.stops,
    };
  },
  /**
   * The color axis appears inside the legend and has its own legend
   * symbol.
   *
   * @private
   * @function Highcharts.ColorAxis#drawLegendSymbol
   * @param {Highcharts.Legend} legend
   * @param {Highcharts.ColorAxis} item
   * @return {void}
   */
  drawLegendSymbol: function (legend, item) {
    var padding = legend.padding,
      legendOptions = legend.options,
      horiz = this.horiz,
      width = pick(
        legendOptions.symbolWidth,
        horiz ? this.defaultLegendLength : 12
      ),
      height = pick(
        legendOptions.symbolHeight,
        horiz ? 12 : this.defaultLegendLength
      ),
      labelPadding = pick(legendOptions.labelPadding, horiz ? 16 : 30),
      itemDistance = pick(legendOptions.itemDistance, 10);
    this.setLegendColor();
    // Create the gradient
    item.legendSymbol = this.chart.renderer
      .rect(0, legend.baseline - 11, width, height)
      .attr({
        zIndex: 1,
      })
      .add(item.legendGroup);
    // Set how much space this legend item takes up
    this.legendItemWidth =
      width + padding + (horiz ? itemDistance : labelPadding);
    this.legendItemHeight = height + padding + (horiz ? labelPadding : 0);
  },
  /**
   * Fool the legend
   *
   * @private
   * @function Highcharts.ColorAxis#setState
   * @param {string} [state]
   * @return {void}
   */
  setState: function (state) {
    this.series.forEach(function (series) {
      series.setState(state);
    });
  },
  visible: true,
  setVisible: noop,
  /**
   * @private
   */
  getSeriesExtremes: function () {
    var series = this.series,
      colorValArray,
      colorKey,
      colorValIndex,
      pointArrayMap,
      calculatedExtremes,
      cSeries,
      i = series.length,
      yData,
      j;
    this.dataMin = Infinity;
    this.dataMax = -Infinity;
    while (i--) {
      // x, y, value, other
      cSeries = series[i];
      colorKey = cSeries.colorKey = pick(
        cSeries.options.colorKey,
        cSeries.colorKey,
        cSeries.pointValKey,
        cSeries.zoneAxis,
        "y"
      );
      pointArrayMap = cSeries.pointArrayMap;
      calculatedExtremes =
        cSeries[colorKey + "Min"] && cSeries[colorKey + "Max"];
      if (cSeries[colorKey + "Data"]) {
        colorValArray = cSeries[colorKey + "Data"];
      } else {
        if (!pointArrayMap) {
          colorValArray = cSeries.yData;
        } else {
          colorValArray = [];
          colorValIndex = pointArrayMap.indexOf(colorKey);
          yData = cSeries.yData;
          if (colorValIndex >= 0 && yData) {
            for (j = 0; j < yData.length; j++) {
              colorValArray.push(pick(yData[j][colorValIndex], yData[j]));
            }
          }
        }
      }
      // If color key extremes are already calculated, use them.
      if (calculatedExtremes) {
        cSeries.minColorValue = cSeries[colorKey + "Min"];
        cSeries.maxColorValue = cSeries[colorKey + "Max"];
      } else {
        Series.prototype.getExtremes.call(cSeries, colorValArray);
        cSeries.minColorValue = cSeries.dataMin;
        cSeries.maxColorValue = cSeries.dataMax;
      }
      if (typeof cSeries.minColorValue !== "undefined") {
        this.dataMin = Math.min(this.dataMin, cSeries.minColorValue);
        this.dataMax = Math.max(this.dataMax, cSeries.maxColorValue);
      }
      if (!calculatedExtremes) {
        Series.prototype.getExtremes.call(cSeries);
      }
    }
  },
  /**
   * Internal function to draw a crosshair.
   *
   * @function Highcharts.ColorAxis#drawCrosshair
   *
   * @param {Highcharts.PointerEventObject} [e]
   *        The event arguments from the modified pointer event, extended with
   *        `chartX` and `chartY`
   *
   * @param {Highcharts.Point} [point]
   *        The Point object if the crosshair snaps to points.
   *
   * @return {void}
   *
   * @fires Highcharts.ColorAxis#event:afterDrawCrosshair
   * @fires Highcharts.ColorAxis#event:drawCrosshair
   */
  drawCrosshair: function (e, point) {
    var plotX = point && point.plotX,
      plotY = point && point.plotY,
      crossPos,
      axisPos = this.pos,
      axisLen = this.len;
    if (point) {
      crossPos = this.toPixels(point[point.series.colorKey]);
      if (crossPos < axisPos) {
        crossPos = axisPos - 2;
      } else if (crossPos > axisPos + axisLen) {
        crossPos = axisPos + axisLen + 2;
      }
      point.plotX = crossPos;
      point.plotY = this.len - crossPos;
      Axis.prototype.drawCrosshair.call(this, e, point);
      point.plotX = plotX;
      point.plotY = plotY;
      if (this.cross && !this.cross.addedToColorAxis && this.legendGroup) {
        this.cross
          .addClass("highcharts-coloraxis-marker")
          .add(this.legendGroup);
        this.cross.addedToColorAxis = true;
        if (!this.chart.styledMode) {
          this.cross.attr({
            fill: this.crosshair.color,
          });
        }
      }
    }
  },
  /**
   * @private
   */
  getPlotLinePath: function (options) {
    var pos = options.translatedValue;
    // crosshairs only
    return isNumber(pos) // pos can be 0 (#3969)
      ? this.horiz
        ? [
            "M",
            pos - 4,
            this.top - 6,
            "L",
            pos + 4,
            this.top - 6,
            pos,
            this.top,
            "Z",
          ]
        : [
            "M",
            this.left,
            pos,
            "L",
            this.left - 6,
            pos + 6,
            this.left - 6,
            pos - 6,
            "Z",
          ]
      : Axis.prototype.getPlotLinePath.apply(this, arguments);
  },
  /**
   * Updates a color axis instance with a new set of options. The options are
   * merged with the existing options, so only new or altered options need to
   * be specified.
   *
   * @function Highcharts.ColorAxis#update
   *
   * @param {Highcharts.ColorAxisOptions} newOptions
   * The new options that will be merged in with existing options on the color
   * axis.
   *
   * @param {boolean} [redraw]
   * Whether to redraw the chart after the color axis is altered. If doing
   * more operations on the chart, it is a good idea to set redraw to `false`
   * and call {@link Highcharts.Chart#redraw} after.
   *
   * @return {void}
   */
  update: function (newOptions, redraw) {
    var chart = this.chart,
      legend = chart.legend,
      updatedOptions = this.buildOptions.call(chart, {}, newOptions);
    this.series.forEach(function (series) {
      // Needed for Axis.update when choropleth colors change
      series.isDirtyData = true;
    });
    // When updating data classes, destroy old items and make sure new
    // ones are created (#3207)
    if ((newOptions.dataClasses && legend.allItems) || this.dataClasses) {
      this.destroyItems();
    }
    // Keep the options structure updated for export. Unlike xAxis and
    // yAxis, the colorAxis is not an array. (#3207)
    chart.options[this.coll] = merge(this.userOptions, updatedOptions);
    Axis.prototype.update.call(this, updatedOptions, redraw);
    if (this.legendItem) {
      this.setLegendColor();
      legend.colorizeItem(this, true);
    }
  },
  /**
   * Destroy color axis legend items.
   *
   * @private
   * @function Highcharts.ColorAxis#destroyItems
   * @return {void}
   */
  destroyItems: function () {
    var chart = this.chart;
    if (this.legendItem) {
      chart.legend.destroyItem(this);
    } else if (this.legendItems) {
      this.legendItems.forEach(function (item) {
        chart.legend.destroyItem(item);
      });
    }
    chart.isDirtyLegend = true;
  },
  /**
   * Removes the color axis and the related legend item.
   *
   * @function Highcharts.ColorAxis#remove
   *
   * @param {boolean} [redraw=true]
   *        Whether to redraw the chart following the remove.
   *
   * @return {void}
   */
  remove: function (redraw) {
    this.destroyItems();
    Axis.prototype.remove.call(this, redraw);
  },
  /**
   * Get the legend item symbols for data classes.
   *
   * @private
   * @function Highcharts.ColorAxis#getDataClassLegendSymbols
   * @return {Array<Highcharts.ColorAxisLegendItemObject>}
   */
  getDataClassLegendSymbols: function () {
    var axis = this,
      chart = this.chart,
      legendItems = this.legendItems,
      legendOptions = chart.options.legend,
      valueDecimals = legendOptions.valueDecimals,
      valueSuffix = legendOptions.valueSuffix || "",
      name;
    if (!legendItems.length) {
      this.dataClasses.forEach(function (dataClass, i) {
        var vis = true,
          from = dataClass.from,
          to = dataClass.to;
        var numberFormatter = chart.numberFormatter;
        // Assemble the default name. This can be overridden
        // by legend.options.labelFormatter
        name = "";
        if (typeof from === "undefined") {
          name = "< ";
        } else if (typeof to === "undefined") {
          name = "> ";
        }
        if (typeof from !== "undefined") {
          name += numberFormatter(from, valueDecimals) + valueSuffix;
        }
        if (typeof from !== "undefined" && typeof to !== "undefined") {
          name += " - ";
        }
        if (typeof to !== "undefined") {
          name += numberFormatter(to, valueDecimals) + valueSuffix;
        }
        // Add a mock object to the legend items
        legendItems.push(
          extend(
            {
              chart: chart,
              name: name,
              options: {},
              drawLegendSymbol: LegendSymbolMixin.drawRectangle,
              visible: true,
              setState: noop,
              isDataClass: true,
              setVisible: function () {
                vis = this.visible = !vis;
                axis.series.forEach(function (series) {
                  series.points.forEach(function (point) {
                    if (point.dataClass === i) {
                      point.setVisible(vis);
                    }
                  });
                });
                chart.legend.colorizeItem(this, vis);
              },
            },
            dataClass
          )
        );
      });
    }
    return legendItems;
  },
  beforePadding: false,
  name: "", // Prevents 'undefined' in legend in IE8
});
/**
 * Handle animation of the color attributes directly
 *
 * @private
 * @function Highcharts.Fx#fillSetter
 */ /**
 * Handle animation of the color attributes directly
 *
 * @private
 * @function Highcharts.Fx#strokeSetter
 */
["fill", "stroke"].forEach(function (prop) {
  H.Fx.prototype[prop + "Setter"] = function () {
    this.elem.attr(
      prop,
      color(this.start).tweenTo(color(this.end), this.pos),
      null,
      true
    );
  };
});
// Extend the chart getAxes method to also get the color axis
addEvent(Chart, "afterGetAxes", function () {
  var chart = this,
    options = chart.options;
  this.colorAxis = [];
  if (options.colorAxis) {
    options.colorAxis = splat(options.colorAxis);
    options.colorAxis.forEach(function (axisOptions, i) {
      axisOptions.index = i;
      new ColorAxis(chart, axisOptions); // eslint-disable-line no-new
    });
  }
});
// Add colorAxis to series axisTypes
addEvent(Series, "bindAxes", function () {
  var axisTypes = this.axisTypes;
  if (!axisTypes) {
    this.axisTypes = ["colorAxis"];
  } else if (axisTypes.indexOf("colorAxis") === -1) {
    axisTypes.push("colorAxis");
  }
});
// Add the color axis. This also removes the axis' own series to prevent
// them from showing up individually.
addEvent(Legend, "afterGetAllItems", function (e) {
  var colorAxisItems = [],
    colorAxes = this.chart.colorAxis || [],
    options,
    i;
  colorAxes.forEach(function (colorAxis) {
    options = colorAxis.options;
    if (options && options.showInLegend) {
      // Data classes
      if (options.dataClasses && options.visible) {
        colorAxisItems = colorAxisItems.concat(
          colorAxis.getDataClassLegendSymbols()
        );
        // Gradient legend
      } else if (options.visible) {
        // Add this axis on top
        colorAxisItems.push(colorAxis);
      }
      // If dataClasses are defined or showInLegend option is not set to
      // true, do not add color axis' series to legend.
      colorAxis.series.forEach(function (series) {
        if (!series.options.showInLegend || options.dataClasses) {
          if (series.options.legendType === "point") {
            series.points.forEach(function (point) {
              erase(e.allItems, point);
            });
          } else {
            erase(e.allItems, series);
          }
        }
      });
    }
  });
  i = colorAxisItems.length;
  while (i--) {
    e.allItems.unshift(colorAxisItems[i]);
  }
});
addEvent(Legend, "afterColorizeItem", function (e) {
  if (e.visible && e.item.legendColor) {
    e.item.legendSymbol.attr({
      fill: e.item.legendColor,
    });
  }
});
// Updates in the legend need to be reflected in the color axis (6888)
addEvent(Legend, "afterUpdate", function () {
  var colorAxes = this.chart.colorAxis;
  if (colorAxes) {
    colorAxes.forEach(function (colorAxis) {
      colorAxis.update({}, arguments[2]);
    });
  }
});
// Calculate and set colors for points
addEvent(Series, "afterTranslate", function () {
  if (
    (this.chart.colorAxis && this.chart.colorAxis.length) ||
    this.colorAttribs
  ) {
    this.translateColors();
  }
});
